While Using A Web Based Order Form

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While Using A Web Based Order Form

, an attacker enters an unusally large value in the quantity field. The value she entered is so large that it exceeds the maximum value supported by the variable type used to store the quantity in the web application. This causes the value of the quantity variable to wrap around to the minimum possible value which is a negative number. As a result, the web application processes the order as a return instead of a purchase, and the attacker's account is credited with a large sum of money. Which practieces would have prevented this exploit?
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Implementing client side validation Implementing server side validation
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